Green/yellow solid state lighting via radiative and nonradiative energy transfer involving colloidal semiconductor nanocrystals
buir.contributor.author | Demir, Hilmi Volkan | |
buir.contributor.orcid | Demir, Hilmi Volkan|0000-0003-1793-112X | |
dc.citation.epage | 1170 | en_US |
dc.citation.issueNumber | 4 | en_US |
dc.citation.spage | 1163 | en_US |
dc.citation.volumeNumber | 15 | en_US |
dc.contributor.author | Nizamoglu, S. | en_US |
dc.contributor.author | Sari, E. | en_US |
dc.contributor.author | Baek, J. H. | en_US |
dc.contributor.author | Lee, I. H | en_US |
dc.contributor.author | Demir, Hilmi Volkan | en_US |
dc.date.accessioned | 2015-07-28T12:06:21Z | |
dc.date.available | 2015-07-28T12:06:21Z | |
dc.date.issued | 2009-08-05 | en_US |
dc.department | Department of Physics | en_US |
dc.department | Department of Electrical and Electronics Engineering | en_US |
dc.department | Institute of Materials Science and Nanotechnology (UNAM) | en_US |
dc.department | Nanotechnology Research Center (NANOTAM) | en_US |
dc.description.abstract | LEDs made of In(x)Ga(1-x)N and (Al(x)Ga(1-x))(1-y)In(y)P suffer from significantly reduced quantum efficiency and luminous efficiency in the green/yellow spectral ranges. To address these problems, we present the design, growth, fabrication, hybridization, and characterization of proof-of-concept green/yellow hybrid LEDs that utilize radiative and nonradiative [Forster resonance energy transfer (FRET)] energy transfers in their colloidal semiconductor nanocrystals (NCs) integrated on near-UV LEDs. In our first NC-LED, we realize a color-converted LED that incorporate green-emitting CdSe/ZnS core/shell NCs (lambda(PL) = 548 nm) on near-UV InGaN/GaN LEDs (lambda(EL) = 379 nm). In our second NC-LED, we implement a color-converted FRET-enhanced LED. For that, we hybridize a custom-design assembly of cyan-and green-emitting CdSe/ZnS core/shell NCs (lambda(PL) = 490 and 548 nm) on near-UV LEDs. Using a proper mixture of differently sized NCs, we obtain a quantum efficiency enhancement of 9% by recycling trapped excitons via FRET. With FRET-NC-LEDs, we show that it is possible to obtain a luminous efficacy of 425 lm/W(opt) and a luminous efficiency of 94 lm/W, using near-UV LEDs with a 40% external quantum efficiency. Finally, we investigate FRET-converted light-emitting structures that use nonradiative energy transfer directly from epitaxial quantum wells to colloidal NCs. These proof-of-concept demonstrations show that FRET-based NC-LEDs hold promise for efficient solid-state lighting in green/yellow. | en_US |
dc.description.provenance | Made available in DSpace on 2015-07-28T12:06:21Z (GMT). No. of bitstreams: 1 10.1109-JSTQE.2009.2015680.pdf: 734891 bytes, checksum: 810e392cf83bcb3881d8c561042f2c37 (MD5) | en |
dc.identifier.doi | 10.1109/JSTQE.2009.2015680 | en_US |
dc.identifier.issn | 1077-260X | |
dc.identifier.uri | http://hdl.handle.net/11693/13443 | |
dc.language.iso | English | en_US |
dc.publisher | IEEE | en_US |
dc.relation.isversionof | http://dx.doi.org/10.1109/JSTQE.2009.2015680 | en_US |
dc.source.title | IEEE Journal of Selected Topics in Quantum Electronics | en_US |
dc.subject | Förster resonance energy transfer (fret) | en_US |
dc.subject | Green/yellow | en_US |
dc.subject | InGaN/GaN | en_US |
dc.subject | Leds | en_US |
dc.subject | Nanocrystals (ncs) | en_US |
dc.subject | Nonradiative energy transfer | en_US |
dc.title | Green/yellow solid state lighting via radiative and nonradiative energy transfer involving colloidal semiconductor nanocrystals | en_US |
dc.type | Article | en_US |
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